ddns-script: Change CURL call and redirect output in update_porkbun_v3

ddns-script: Change CURL call and redirect output in update_porkbun_v3

This also fixes: https://github.com/openwrt/packages/issues/26181

CURL funciton change was patterned on other ddns update scripts
that uses also JSON request/response payloads similar to
update_digitalocean_v2.sh: https://github.com/openwrt/packages/blob/15014f93e15bcb29956bf79cd397fea580bf6ea6/net/ddns-scripts/files/usr/lib/ddns/update_digitalocean_com_v2.sh#L29
update_gcp_v1.sh: https://github.com/openwrt/packages/blob/15014f93e15bcb29956bf79cd397fea580bf6ea6/net/ddns-scripts/files/usr/lib/ddns/update_gcp_v1.sh#L212

rebased and bumbped ddns-script version

Signed-off-by: Rikki Vizcarra <redacted>